As a sub-area of culture in Belgium, sport is now considered to fall under the responsibility of the 3 Belgian communities (the Dutch-speaking Community, the French-speaking Community and the German-speaking Community). With the exception of football and field hockey, all other major sport federations in Belgium are split into 2 major federations (a French-speaking federation and a Dutch-speaking federation).

At the Olympic Games, Belgium has won four gold medals for road cycling, with two victories for the Belgian men's team in the team time trial (at the 1948 and 1952 Summer Olympics) and two for André Noyelle and Greg Van Avermaet for the individual race. Belgium has had the most World Championship gold medals (25) with 3 victories by Rik Van Steenbergen and Eddy Merckx and 2 by Georges Ronsse, Briek Schotte, Rik Van Looy and Freddy Maertens. Belgian cyclists have also performed very well in the 3 grand tours. Ten cyclists have won the Tour de France 18 times between them, making of Belgium the country with the most Tour de France wins behind France. Besides Eddy Merckx, Philippe Thys won the most prestigious tour 3 times while Firmin Lambot and Sylvère Maes won it twice. The last Belgian winner at the Tour de France however was Lucien Van Impe in 1976. At the Giro d'Italia, Belgium has had 7 wins, being the second most successful country in terms of wins after Italy. Michel Pollentier and Johan De Muynck (the most recent Belgian to win the Giro in 1978) are with Eddy Merckx the 3 Belgian winners of this tour. Belgium also has had 7 wins at the Vuelta a España, with 2 wins by Gustaaf Deloor, the first winner of the race in 1935 and 1936. The last Belgian winner of the Spanish tour was Freddy Maertens in 1977.

Many Belgian cyclists have won one of the five monument cycle races. At the Tour of Flanders, Belgium counts 68 wins in 96 editions with 3 wins for Achiel Buysse, Eric Leman, Johan Museeuw and Tom Boonen. Roger De Vlaeminck holds the record of wins at Paris–Roubaix together with Tom Boonen (4), and Belgium is the most successful country in this race with 55 wins in 110 editions. Liège–Bastogne–Liège has been won 59 times out of 98 by Belgian cyclists. Eddy Merckx holds the record of the most individual wins (5). At the Giro di Lombardia, Belgium counts 12 titles in 105 editions, with only Italy performing better. Milan–San Remo was won 7 times by Eddy Merckx, who holds the record of the most wins, and Belgium has won 20 times out of 103, being the second most successful country after Italy in this race. Unlike the grand tours, which have not been won by a Belgian since 1978, cyclists from Belgium are still successful in the monument races. At Paris–Roubaix, Tom Boonen has won 4 times and Johan Museeuw 3 times since 1996, and Peter Van Petegem and Johan Van Summeren have also won the race once each. At the Tour of Flanders, Belgium has 12 wins since 1993, with 3 by Johan Museeuw and Tom Boonen, 2 by Peter Van Petegem and Stijn Devolder and 1 by Andreï Tchmil and Nick Nuyens. In the other 3 monuments, Belgians has been less successful recently, with Andreï Tchmil being the only Belgian winner of Milan–San Remo (in 1999) since Fons De Wolf in 1981. Philippe Gilbert has been the only Belgian winner of the Giro di Lombardia since Fons De Wolf in 1980, with wins in 2009 and 2010 and only 4 Belgians have won Liège–Bastogne–Liège since Joseph Bruyère in 1978: Eric Van Lancker in 1990, Dirk De Wolf in 1992, Frank Vandenbroucke in 1999 and Philippe Gilbert in 2011.

Over the history of the European Athletics Championship, Belgium has had five gold medals, ten silver medals and seven bronze medals. The Golden Spike is awarded annually to the season's best Belgian male and female athletes.

Rugby union is a growing sport in Belgium which, due to the growing mediatisation around the sport, especially during the 2003 and 2007 World Cup, is enjoying a rise in popularity. The game is formally organised by the Belgium Rugby Federation and has a surprisingly long history. Belgium has 57 clubs and 10,071 players according to the International Rugby Board who currently rank Belgium as tier two nation ranked at twenty-sixth in the world.

Rally is popular sport in Belgium and although no money prizes can be won, many talented drivers participate in the Belgian Championships. The rally sport is overseen by the RACB organization. Belgium is known for its technical special stages on narrow tarmac roads and steep ditches.